Looper-operating mechanism for sewing-machines.



Patented Aug 6, IBM.

7 L., ONDERDUNK. LOOPEB OPERATING MECHANISM FOR SEWING MACHINES.

(Applicatioxi filed Aug 23, 1897.) (No Model.)

THE norms Pmni 00,, momma. WASHINGTON D c.

UNITED I STATES PATENT OFFICE.

LANSING ONDERDONK, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE UNIONSPECIAL SEWING MACHINE COMPANY, OF CHICAGO, ILLINOIS.

LOOPER-OPERATING MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 679,906, dated August6, 1901. Application filed August 23, 1897. Serial No. 649,245. (Nomodel.)

To all whom it may concern:

Be it known that I, LANSING ONDERDONK, a citizen of the United States,residing at Boston, in the county of Suffolk, State of Massachusetts,have invented certain new and useful Improvements in Sewing-Machines, ofwhich the following is a description, reference being hadto theaccompanying drawings and to the letters of reference marked thereon.

Myinvention relates to an improvement in sewing-machines, and especiallyto a looperoperating mechanism for chain-stitch machines. In a'number ofprior patents issued to me October 12, 1897, and numbered 591,541,591,542, 591,546, 591,559, and 591,538, I have shown, described, andclaimed various forms of looper-operating mechanisms, in all of which aninclined pin or rod supported on the forward end of a driving-shaftengages a looper-carrier supported on a transverse shaft, which shaftpractically forms oppositely-extendin g journals or trunnions for thelooper-carrier, which journals or trunnions are mounted to slide androck in fixed bearings on the machine-frame, the aforesaid pin or rodengaging the looper-carrier in such a Way that by reason of its beingconfined in bearings it has a reciprocating sidewise movement and anoscillating forward-and-backward movement as the driving-shaft isrotated.

The object of the present invention is to provide for a series ofadjustments in machines in which the looper is operated by an inclinedcrank,[such adjustments being provided so that no matter whether thereare slight defects in the construction of the various parts which areput together to make up the looperoperating mechanism these defects maybe remedied by these adjustments. By these adjustments, therefore, thetransverse shaft may be arranged at different distances from the end ofthe main shaft of the different Ina-1 chines, thethrow of the looper maybe varied, and the center of movement be changed at will withoutdisturbing the proper relation of the various centers above referred to.

In the accompanying drawings,which illustrate the invention, Figure 1represents a portion of a sewing-machine,'partly in section, embodyingmy invention. Fig. 2 is a sectional view of the end of thedriving-shaft. Fig. 3 is an end view of the head of the drivingshaft.Fig. 4 is a sectional side elevation showing a modification of thearrangement for attaching the inclined pin to the head of the mainshaft. Fig. 5 is a similar view showing an arrangement for changing theangle of the inclined rod orpin, and Fig. 6 is a plan View of Fig. 5.Fig. 7is a view similar to Fig. 5, illustrating the adjustment appliedto Fig. 1.

In the drawings, referring first to Figs. 1, 2, and 3, A represents thedriving-shaft, having on its outer end a head secured thereto in anysuitable manner. C represents the needle-bar; D, the looper-carrier; F,the oppositely-extending trunnions or journals by which thelooper'carrier is supported in bearings near the forward end of thebed-plate of the machine. The looper is shown atf, and thelooper-carrier has wings g,which embrace the inclined operating pin orrod G, which passes through a fulcrum-block h, set in thelooper-carrier. Formed in the face of the enlarged head on the end ofthe driving-shaft is a dovetailed groove H, withinwhich slides and isadjustable across the face of the driving-shaft theenlarged head of theinclined pin or rod G. It will be seen that by raising or loweringwithin certain limits the head of the pin or rod G in the dovetailedgroove in the face of the enlarged head on the end of the shaft nochange is effected in the relations of the centers of the driving-shaft,transverse shaft, or pin or rod to each other, but there is merely avariation in the distance from the end of the driving-shaft at whichthese centers are coincident.

Figs. 5 and 6 illustrate an arrangement whereby not only the distance ofthe face of the driving-pin from the center of the main shaft may beadjusted, but also an arrangement at which the angle of the driving-pinmay also be changed, thus giving more or less pitch to the driving-pinand increasing or diminishing the throw of the looper. The driving-pinis adjustable independently of the block that holds it at any anglebyarranging the block with an opening through which the pin or rod Gpasses, this opening being enlarged toward either end and the pin or rodG being pivoted upon opposite sides of the pivot a and by loosening onescrew and tightening the other the pitch of the driving-pin will beincreased or diminished, and consequently the throw of the looperchanged. This change would also vary the point at which the center ofthe driving-pin would cross the center line of the main shaft, and asthis is necessarily thecenter of the transverse shaft the adjustableblock to which the pin is secured would have to be moved to a point thatwould bring the driving-pin to the common center. To make the first haveto be loosened, thus leaving the driving-pin free should the block moveto the necessary point to give the desired angle to the driving-pin,after which the screws could be set to hold the driving-pin firmly inthe d esired position or angle.

As shown in Fig, 4, the driving-pin is secured to a curved block, whichslides in a correspondingly-shaped groove in the head on the end of themain shaft. This block is seon red by two set-screws 0 0 which areloosjustment. The curve to the block is on the arc of a circle, of whichthe crossing-point of the three centers above referred to is the center,and thus the adjustment of this block one way orthe other does notchange the relative centers or the throw of the looper that may occur.It will be noticed, however, that the adjustments of the pin orrod G bymeans of the screws a 03, as illustrated in Fig. 7, are more essentialin the use of the straight block K or enlarged head of the pin G than inthe curved one.

Havingthus described my invention, what I. claimas new, and desire tosecure by Letters Patent, is

1. The herein-described looper-operating mechanism, comprising adriving-shaft, a looper carrier, a block radially adjustable across theface of the driving-shaft, a rigid inclined pin or rod secured at ornear one end to said block,;and means carried by said block adjustmentproperly, the two screws would for adjusting the inclination of said pinor rod with reference ,to the axis of the driving-shaft;

1 substantially as'de'scribed.

2. The herein-described looper-operating ime'chan'ism, comprising adriving-shaft, a looper-carri'er, a block radially adjustable across theface of the driving-shaft, a rigid tinclin'ed pin or red, pivotallysecured to said block, and means carried by said block for adjusting thepin or rod on its pivot to vary the inclination of said pin or rod;substani tially as described.

ened and set to meet the requirements of adf 3. The herein-describedlooper-operatin g mechanism, comprising a driving-shaft, a v

looper-carrier, a block radially adjustable across the face of thedriving-shaft, a rigid inclined pin or rod, pivotally secured to saidblock, and means carried by said block. for adjusting the pin or red onits pivot to vary I the inclination of said pin or rod, said meansincluding stop-screws arranged on opposite sides of the piv0tpoint;substantially as described.

In testimony whereof I alfix my signature in presence of twowitnesses...

LANSING ONDERDONK.

Witnesses:

A. H. HATCH, J. S. HOLT.

